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 <h2 title="Interface TransformationRule" class="title">Interface TransformationRule</h2>
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 <dt>All Known Subinterfaces:</dt>
 <dd><a href="../../../../../org/apache/calcite/rel/rules/SubstitutionRule.html" title="interface in org.apache.calcite.rel.rules">SubstitutionRule</a></dd>
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 <dl>
 <dt>All Known Implementing Classes:</dt>
 <dd><a href="../../../../../org/apache/calcite/rel/rules/AbstractJoinExtractFilterRule.html" title="class in org.apache.calcite.rel.rules">AbstractJoinExtractFilterRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateCaseToFilterRule.html" title="class in org.apache.calcite.rel.rules">AggregateCaseToFilterRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateExpandDistinctAggregatesRule.html" title="class in org.apache.calcite.rel.rules">AggregateExpandDistinctAggregatesRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateExtractProjectRule.html" title="class in org.apache.calcite.rel.rules">AggregateExtractProjectRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateFilterTransposeRule.html" title="class in org.apache.calcite.rel.rules">AggregateFilterTransposeRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateJoinJoinRemoveRule.html" title="class in org.apache.calcite.rel.rules">AggregateJoinJoinRemoveRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateJoinRemoveRule.html" title="class in org.apache.calcite.rel.rules">AggregateJoinRemoveRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateJoinTransposeRule.html" title="class in org.apache.calcite.rel.rules">AggregateJoinTransposeRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateMergeRule.html" title="class in org.apache.calcite.rel.rules">AggregateMergeRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateProjectMergeRule.html" title="class in org.apache.calcite.rel.rules">AggregateProjectMergeRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateProjectPullUpConstantsRule.html" title="class in org.apache.calcite.rel.rules">AggregateProjectPullUpConstantsRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/AggregateReduceFunctionsRule.html" title="class in 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org.apache.calcite.rel.rules">SubQueryRemoveRule.SubQueryFilterRemoveRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/SubQueryRemoveRule.SubQueryJoinRemoveRule.html" title="class in org.apache.calcite.rel.rules">SubQueryRemoveRule.SubQueryJoinRemoveRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/SubQueryRemoveRule.SubQueryProjectRemoveRule.html" title="class in org.apache.calcite.rel.rules">SubQueryRemoveRule.SubQueryProjectRemoveRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/TableScanRule.html" title="class in org.apache.calcite.rel.rules">TableScanRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/UnionEliminatorRule.html" title="class in org.apache.calcite.rel.rules">UnionEliminatorRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/UnionMergeRule.html" title="class in org.apache.calcite.rel.rules">UnionMergeRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/UnionPullUpConstantsRule.html" title="class in org.apache.calcite.rel.rules">UnionPullUpConstantsRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/UnionToDistinctRule.html" title="class in org.apache.calcite.rel.rules">UnionToDistinctRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/ValuesReduceRule.html" title="class in org.apache.calcite.rel.rules">ValuesReduceRule</a></dd>
 </dl>
 <hr>
 <br>
 <pre>public interface <span class="typeNameLabel">TransformationRule</span></pre>
 <div class="block">Logical transformation rule, only logical operator can be rule operand,
  and only generate logical alternatives. It is only visible to
  <a href="../../../../../org/apache/calcite/plan/volcano/VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano"><code>VolcanoPlanner</code></a>, <a href="../../../../../org/apache/calcite/plan/hep/HepPlanner.html" title="class in org.apache.calcite.plan.hep"><code>HepPlanner</code></a> will ignore this interface.
  That means, in <a href="../../../../../org/apache/calcite/plan/hep/HepPlanner.html" title="class in org.apache.calcite.plan.hep"><code>HepPlanner</code></a>, the rule that implements
  <a href="../../../../../org/apache/calcite/rel/rules/TransformationRule.html" title="interface in org.apache.calcite.rel.rules"><code>TransformationRule</code></a> can still match with physical operator of
  <a href="../../../../../org/apache/calcite/rel/PhysicalNode.html" title="interface in org.apache.calcite.rel"><code>PhysicalNode</code></a> and generate physical alternatives.

  <p>But in <a href="../../../../../org/apache/calcite/plan/volcano/VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano"><code>VolcanoPlanner</code></a>, <a href="../../../../../org/apache/calcite/rel/rules/TransformationRule.html" title="interface in org.apache.calcite.rel.rules"><code>TransformationRule</code></a> doesn't match
  with physical operator that implements <a href="../../../../../org/apache/calcite/rel/PhysicalNode.html" title="interface in org.apache.calcite.rel"><code>PhysicalNode</code></a>. It is not
  allowed to generate physical operators in <a href="../../../../../org/apache/calcite/rel/rules/TransformationRule.html" title="interface in org.apache.calcite.rel.rules"><code>TransformationRule</code></a>,
  unless you are using it in <a href="../../../../../org/apache/calcite/plan/hep/HepPlanner.html" title="class in org.apache.calcite.plan.hep"><code>HepPlanner</code></a>.</p></div>
 <dl>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../../../org/apache/calcite/plan/volcano/VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano"><code>VolcanoPlanner</code></a>,
 <a href="../../../../../org/apache/calcite/rel/rules/SubstitutionRule.html" title="interface in org.apache.calcite.rel.rules"><code>SubstitutionRule</code></a></dd>
 </dl>
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